A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is ______.

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A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is Bi. Explanation: Because the dissociation energy of the Bi-H bond is very low, BiH3 is the strongest reducing agent among the hydrides of the 15 group elements.

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